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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9f501cfb6085f17ce4a80d6634932c295ffcc9aaaf84b2698a4af6a1ec5f0f' 
  AND token = '7A7MU2UT8A/9vEtuz3O5XVl/U/+yQIGvjVtYcGeaY4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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