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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e430727e1a9c80b8ee21025b06c9b99033934c8d8f01fe7602cb3437e3030c' 
  AND token = 'bVphbnZ/aieoAc5RFCgH14U/610gUG+tv/PNm5hH1T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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