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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02504b38b995605f5668384dd6c732e9d867cf3a8c6e0aa235a6e1f30cf57e14' 
  AND token = 'fNxncGimgw1jd3Qf5qPWe363debSqozgekUMkReuQmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}