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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a89d50b0d66d39d1ef0497aa89b8b08aeaccc58742e6f8d15388e1f876d850' 
  AND token = 'isQjaJbCWOtnbyure+wzvpDQqn80voT88eDfqz7p88g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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