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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e84e183615af7166fbb7914a0bebc00fc964113caa9df7685a97a0c661f6bd' 
  AND token = 'ZqlcwTs9eAVaFLinUFm45P1uL6SDeWPhzcbaBskz4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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