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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0b0142fbaac202282ee204069c9fd3fd930ce1dce5deb9ec99043350f127d3' 
  AND token = '1kxSwizg1eIuqewrO05y0oudm7GNLlyCqjD6ttjwssk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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