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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df22fcd5fae70d18108ed772ece2eb8f799441c9d892d081ad6743800b056053' 
  AND token = 'rbT2iKkC2byvbO1M6D8SN4X+6Ge6tclEvVSZbSbQB1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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