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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98508e0208d4a9a38c158519b7f0fa0a468849bc97500c78d418d68210a209e' 
  AND token = 'IrTdHcRWp3NpBa4mdKXBo0XTr9fXR/nz5Z+Fewcrg2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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