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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f79c7b70a2f4287f5e419796fcd077492171ea98c16e136b4b7009a697aa34' 
  AND token = 'I3+NWlPezgCJ7jljfujHRFjbSA7fep+YUuCOP4ZNaQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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