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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0badf23b7a58d1fb7aa30e57fec243772f0f2f6b3f88717576454ede74e4af22' 
  AND token = 'fWH6VFDGcjB6l1i7PI7KYtSCx1QwIwmOn6mRS8dsKQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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