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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fce426423b488b3140543320a402f51f1fcd77e7cbcefcc4fd5b9cb2fee6ed' 
  AND token = 'LCUOyHiBwdCWAsQQ1GMPe0kdcN+rb/qS7EPKjXBHdnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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