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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8754fb87728622bf631b42589a5b6c7b1caf4758f0d8e9515ee3d4493b738b' 
  AND token = 'YzxMAvjvV4GHYxG7Mt6MONtf4b1mvDri7yCb8eQBSIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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