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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e2ec7029aa9ad8639b1e79af25b2abca5d60d32026da9877031cf38854f4da' 
  AND token = 'aixZFjrR/c9Ez8fOnDRPE4/njSx5zNCCk7kupqjqajc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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