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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b6194ba3a36b57c0f439343ae6ec6bb4c7f91dd86be11858612b1309641cad' 
  AND token = 'Xxs6co5lmtlpiaC7yEcyVhXD/VUIBk669xwS4b5s4lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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