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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcc91bd7e4d13a58d4806681e03ab230e179772e9d57f9ef922ce95e6355512' 
  AND token = 'xUvAPkS6Fm+Yo0CxbMw2K0emIEFZEqPEvS3fM8swL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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