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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32afc64600568645a89ce5e69e9ef677f386fd8c79097ef816fe1914312a347' 
  AND token = '8OW05LtASdV8vu7q65FErNU6Y6Z1IDALUmGJdeBKvPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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