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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d6d1ebc3e75101b8589ad42c1bb7c07250f58f064b541dc5f47acfedee83f1' 
  AND token = 'hzSOkivGFRfgCaQ8tkazdrhCX8rkp2tpSbsXk3J/GdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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