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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031eea494ce2fe0358d20205ae60bb7c0f74b42386b69dd88048eb0c6051d8fb' 
  AND token = 'DBqv2tMf0gbZX67fxd3pfGpityVel2E8wZjUZ9BJ+UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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