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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97448d815e0606b88e251105c140163aeed4891ddaa4c9e7567d4e72167a8e53' 
  AND token = '2U0t+IudrfU/IBl8mgs/CDfrkCjztcrsBqFp2W8O9r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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