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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd569510a3ef133f5e0a09ac35c19e47bb2cebe50869b7a63bce6a34cbfe665ff' 
  AND token = 'tkuGoT97QlKHQYMGz7ECXIFL+m/xCZ+6uOQDQ7ef+ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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