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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce90b8ae6d3464592df0038215a41a621abdf684e74532044729ccbf7395539' 
  AND token = '/F9OegbCkxkefakRA2gNPsuaTqSfm/B+P+gb/dT08AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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