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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb30e5476a06c029af629cf12accfbca5edb7ccc52e90ce3e1d88753d9007c1' 
  AND token = 'b88YittCMPQW5qrK2vdS7jTL8O+kxDeIWcnLOx91szk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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