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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3caae6fa618c701aba6fc05b70d759fab99de019638d7e7f49812cafdf8d31' 
  AND token = 'hULxOoZBAy8a/p7g+Myfr/LNk8c83OCUvGP7uv2h9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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