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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbf90e6d2724b203f388be35ba86f20b5e62eba7ba85d380bcb026385825be5' 
  AND token = 'AUBUYhdlwxF2q1Xtso13uPgRpnhNEMwcuCvyqq+RQr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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