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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611006e39c4603a019c1555c55d25be9f9130f601b8a59c647e2803c903199e9' 
  AND token = '2hc8e46aQZ7W9diSLRoPKSoMGTxjYo09DBdi+4bi4MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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