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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd3c99c85619a22061eb62d12ce1a201eacaea503ea85d2e52ee099d0a6d9d4' 
  AND token = 'leLjjEo8gKpHgxyLjLnyod0clK0Z0BRglO53FfHNMaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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