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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27827c43725361b517b9daae2f9ba15ca29e5c16cf7caa47d5b657d5b2dfdd4f' 
  AND token = 'fuvRNTsY/yq18d9HwlGdCpTq85GSit7ya/RA5bldy+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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