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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43df9399551b9ba2d94a427dff122dc7be8869c03b2252088d6c1ee65434d58b' 
  AND token = 'B49cVgoC53BIxbOLm8NA53Mb6x8crkugcmyvSv5T5/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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