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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d20ae04669dc8bf4b0925a28270b83db3671641eff6f1d622ec9a031c35433' 
  AND token = 'Oe4PCelNolvOyg9UBJXt9szfh+3Gx0qCWcKGfiWT0eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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