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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170fa8b1880de40d12e9f7ed82129554bb3d97fe2867b7fae034d9f6f929a5d9' 
  AND token = 'Dg6FkSffVttRTItXzpYRTnOnYQ0QwEcMTf5OsF46gFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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