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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b43c407afd62f333cbc77510a6b555707e112a5802b78b3f3ad8f6e4a4fa93c' 
  AND token = 'L/Yn0ymsnCeCj0J8aUJ32UXkILch1izPKwnWf2Qo66M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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