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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fb2bec2518cc1170a8bc4961610b64b6855224e0ba2cd97637c68579375dea' 
  AND token = 'mhXN41Lv+dewsvv2C50Jn4gkfhEU5voYGzi3IfjUE5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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