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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0010c09a335ce57709337a9c3d49bea35a2315144e03fcbb7e4ba89c6dd3837' 
  AND token = 'xaOE9EKgqRtR8NFmdhuDleoxjV3+MSpJfNeaI1F9YtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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