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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa9aeff4e97a169c7a62e7698db36a318afc4db3969cc69ed4c95fe23c371f7' 
  AND token = 'UXLR3uLeH6YjBVVMPQ4WR0ckCsirHX7I8wrJp+udwZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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