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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f58b387c85f1ada1ea5a9fa526f6b83bb29133ebdc832414e178a41de5f2bab' 
  AND token = 'oV8C1sN/Z47qgx7ExyPbZesNdM14kMByzzmgeR/w2SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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