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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7706de2cc422d6834a925251440c91ef50199b4c3b517d578380b1e4b0e9f8a9' 
  AND token = 'hRxp1eG5RbR+8CU4QEl3IpvgyF2UbFKEkpAGaqZ3OgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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