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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22beb0e18b58b9f8fd000f6ceeb83c4298e85dd1251945f64627716c6fda3ea5' 
  AND token = 'mnqTYOCWYDAK4CCrUsav1bbxeNc2CrN5koxyiHpdAds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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