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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0381b740fd154875fb6bb829f9e98968afc4332347a17440fe9875e00d2185' 
  AND token = 'OvHjg2ph94KtVYEACnfgk6LupMy9WC1hkTbQ1sNKQRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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