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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc87901b58775ba1e7d3a39dd2deba8beae6e503edbe328646588069de7ea2c5' 
  AND token = 'Pfb0RkmSrjR2UuBlL2f33ksa6FzUvDL55meEhjp094I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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