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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62752275944c7cd0ddebeb3dc8df14edb6a71f540a6368f3f2ffd32b964842f' 
  AND token = 'AD9EUJO5qM44wRixDcg7FrcXvPuhUt+DP9FHhN5Olls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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