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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a4d43a6a5bf38d989beb1df7b2f5add3998c93fbf5b0b816b9e4a6e7e737ab' 
  AND token = '2wuNIfb1GJr5hgrUT9oxRJn1jsO+n3JExNHpH3u4yg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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