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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6652c4a74d77f7c1c1762ae6455efef6eb95fd75da0ebc083ddf795ef12375c' 
  AND token = 'BoiyOhZG9XmuQo/dukkQjoWfWelklszyMcGNcJP+MpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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