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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379141d1a8db11b89adef868a5ea347cebd6c91a2815a5a2a7f476dfbfb023f6' 
  AND token = '+ZLQtVuG3A359HLRKHFbgJXZcAqt86EoY66VyR3haEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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