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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ff6d1688e3b63c0efd0bc5476d77646a3efe983e4ab0abfe251acdf1160bb4' 
  AND token = 'lKS0piVK0VhMWBYrqfSLaZywRJ//cy7Xpo1jpJGMe3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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