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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f8eba69b1e064ab154955208f25cb220c8a7452f0eba9f608f05ecf83ab736' 
  AND token = 'J9zkIdZ56lRbFhxr/JzU0BJ5MOlfLevZhIbCNgkYBJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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