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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e0f2fb7297a91ac0696695efa55b51a98e2345db882ab4d0d8167728f887db' 
  AND token = 'DwGJ1LPUgpqe5Dzvk2eTlu3Xu6DJq404UTaBjrOoiEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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