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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b549e32fd0355125cdf8d234b65c8a68dce88a9c4bfcb67fc9ea8f2be45ba0' 
  AND token = 'COMKPM9jsrxSdR6TM0BjKzOBQdrfTSxhOxO1hr6SWdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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