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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b79251a2e0c4acce715250dab844e6ae1cffdfebd456dc33fe904c3c0766d5' 
  AND token = 'RJ2mSGsXxDLdPpwC6qmgP57+ZWnFiF+AxBCRRh9Wy7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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