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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fab9fe6ede2b0ceb2068d4b4f8384cedba767b8fa2eed897d92c3bf8e00e7e7' 
  AND token = 'GuRk1mgRdAIPIdg0tsZSnIVOrrpxELfaEPBWhCTq0so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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