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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24c2e946a39c1b38a722462671a09e5fe67c369388b32b345328810e65e607c' 
  AND token = '1Ubv8/c9vNv7EqR8fGO/dd9ZBMHTAvRCjXuW7dNBtPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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