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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625f7db1c6ce5b7e8fdeb02af219852679b2ce697083dce889183c7b95037492' 
  AND token = 'aRu+AdjjTKJL2u4HJWH/nQ6fe73O6SzScn1S3Ssh5ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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