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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907282de2bbcb5b303366460ac03964861866b1b2210c757d04b44262920ec80' 
  AND token = 'efvfP0DnlCDrIbj7GPJE1/s3WEgXrt+3ZigpUAMNeoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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