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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4b6897aad499e277e0e5b0f7f18543e6cf8435f9196a202786726a49721458' 
  AND token = 'Bxnzku2dYspz7Vi8bWyhSRM9VPOw2T8FNvvebl3ip7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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