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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8875e35e0c865a2b96c4f10d99b8e84965c712f618c3d403546a7cb41d5b0361' 
  AND token = '5+bm7TmpX+G3gdi8nK3c5dzouzsXFdlWDhwrIaeHnl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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