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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf8c2a3d653f15ba5f137d924740051f1ff08dac6b66c629936119dcd5f1e4e' 
  AND token = 'd2L0DbW0IGLsbS43C/rdKoCs1ggUuQUeA4pVB3kkdfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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