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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f43ff46a4a266f567bc4e43da0e872fdb247a62c0636ba6cc126ad256eeb32b' 
  AND token = 'U8f5SKIVlfvhydfIbUoLUI6gf35XGw08E0nuj/jjozo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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