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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993954d24ebb25425d1aa3b0e0f6f0b90169ba5bb30eda2943ae738d6e3aaaf8' 
  AND token = 'lXoa/jSdx38N/7e/1urZMzul1DGxl6wr7+ySR7cWLC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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