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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df22dfa32c655883725916e7736faa4ddf2eae6bf044296b7ac6dfff26495448' 
  AND token = 'qiV4V5VZe3CmdaI/3AXy14gf4pT2f3V83GrLWG3fa1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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