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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541307338f11af9d41b32455de78668a80e71035ae5b12cf4b40ba33d4466a20' 
  AND token = 'U74s+9DmXplkTrqiZVRbgT3QqH3r2//MgST3zX4tmZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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