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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f5c77dcf8fe4b90d4f764807da3870a0366998758057dde8349f3611158f29' 
  AND token = 'xdStyiclF59RRm96fFvtiUSE2G78q2mmzlU5waaYtUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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