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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f88a213cf142145874ddcbc40daf867c9b1b1ecf463c05e8018fc383c3241c8' 
  AND token = 'iFpr0MS1I4XTLkZgcPCOBfzn0dGLHCaIyjN95l/G+vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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